My project works well but I have a problem that relay module start immediately when start project in blynk app on my mobile phone. I don’t want to start relay module when app started. I tried to change GPIO output value 0 to 1 or 1 to 0 but it didn’t change anything.

hi blynkers!
the esp8266 mcu is widely used in iot projects. however, most gpio pins on this mcu have special / multiple functionality and are not safe to use in all circumstances.
these “features” are still not well documented and not explained in a friendly manner for newbies. i see lots of cases when the “issues” are simply caused by not knowing which pins to use in which case.
[esp8266 pin features]
here is a basic table for startup. i’ve collected the info from various sources on the in…

Then if you’re still having problems post your code (correctly formatted with triple backticks of course).